Prasad wrote:The AMCA needs a 100KN engine first. Lets think of TVC after that.
Or not think of it at all. The applications of TVC on a modern battlefield (not air-show displays like that F-22 earlier) are questionable. Most of the MKI's great maneuverability (in a battlefield context) is provided by its design and available thrust rather than the TVC. Both the Su-27 and the Mig-29 could perform Pugachev's cobra and the tail-slide for instance without using TVC. The issues with using the Cobra or other TVC enabled post-stall maneuvers in actual combat were pointed out very well by AM Harish Masand in his interview (fighter pilot podcast). He specifically mentions that he would rather have more thrust and less weight (TVC mechanism increases weight) in a dogfight rather than whatever advantage the TVC itself would give because post-stall maneuvers make you lose speed very quickly and while that can perhaps get you a first-shot advantage against your immediate adversary you will be a sitting duck for his wingman or another enemy aircraft in a multi-aircraft engagement because of your very low energy state following the maneuver. Now this is a guy who is famous for his great flying displays in the Mig-29 (not to mention his Sabre kill in 1971) so he knows what he's talking about.
I'm not saying that TVC is useless, but you have to be willing to make compromises, primary one being additional weight and then carefully look at whether the advantage you will receive because of that is useful enough. The Americans decided it wasn't when they designed the F-35 after the TVC enabled F-22.